As I understand it, a movie not having ‘tight’ writing doesn’t mean it has plotholes per say, just that it isn’t as efficient with its scenes/dialogue/plot as another movie.

I don’t have an opinion on if ANH or ESB has tighter writing, since they are both incredibly efficient with the amount of character/plot progression per minute of screentime. Even ROTJ is fairly tight in terms of bringing the Luke/Vader relationship to a conclusion.

I think a good example of flabby writing would be Anakin/Padme in AOTC, where they have a half-dozen scenes which don’t move their characters forward at all in the eyes of the audience. Another is the Exegol plot from TROS, where our characters go to four or five locations just to find a mcGuffin while barely developing as characters at all. But again, the problem is a lack of character progression per scene, not necessarily how flabby/nonsensical the plot becomes. Tight writing, in this case, does not equal a tight plot. Fury Road has a simplistic, borderline stupid plot, but it packs so much character work into each scene that one would never call the writing flabby.